创建线程的三种方法 ------ (笔记)

1. 继承Thread类

   public class Test1 extends Thread {
         
         
       @Override
       //重写run方法
       public void run() {
         
         
           for(int i=0;i<20;i++){
         
         
               System.out.println("子线程");
           }
       }
   
       public static void main(String[] args) {
         
         
           Thread thread = new Test1();
           //线程开启不一定立即执行 由CPU进行调度
           //调用start方法创建子线程执行 调用run方法都是主线程执行
           thread.start();
           for(int i=0;i<20;i++){
         
         
               System.out.println("主线程");
           }
       }
   }
   

2. 实现Runnable接口 最常用

   public class Test1 implements Runnable {
         
         
   
       @Override
       public void run() {
         
         
           for(int i=0;i<200;i++){
         
         
               System.out.println("子线程");
           }
       }
   
       public static void main(String[] args) {
         
         
           Thread thread = new Thread(new Test1());
           thread.start();
           for(int i=0;i<200;i++){
         
         
               System.out.println("主线程");
           }
       }
   }
   

3. 实现callable接口,可以捕获抛出异常，可以带返回值

   public class Test1 implements Callable<Boolean> {
         
         
   
       @Override
       public Boolean call() {
         
         
           for(int i=0;i<10;i++){
         
         
               System.out.println("子线程");
           }
           return true;
       }
   
       public static void main(String[] args) throws ExecutionException, InterruptedException {
         
         
           Test1 test1 = new Test1();
           //线程池
           ExecutorService service = Executors.newFixedThreadPool(1);
           Future<Boolean> future = service.submit(test1);
           boolean b = future.get();
           System.out.println(b);
           service.shutdownNow();
       }
   }